feat(cmd): add list command to display tracked units

cmd/list.go

@@ -0,0 +1,89 @@
+package cmd
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/warkanum/unitdore/config"
+	"github.com/warkanum/unitdore/systemd"
+)
+
+var listCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List all tracked units with service file locations",
+	RunE:  runList,
+}
+
+func init() {
+	rootCmd.AddCommand(listCmd)
+}
+
+func runList(cmd *cobra.Command, args []string) error {
+	cfg, err := config.Load(configPath)
+	if err != nil {
+		return err
+	}
+
+	if len(cfg.Units) == 0 {
+		fmt.Println("No units tracked. Run 'unitdore syncup' to discover containers.")
+		return nil
+	}
+
+	units := make([]config.Unit, len(cfg.Units))
+	copy(units, cfg.Units)
+	sort.Slice(units, func(i, j int) bool {
+		if units[i].Order != units[j].Order {
+			return units[i].Order < units[j].Order
+		}
+		return units[i].Name < units[j].Name
+	})
+
+	prefix, suffix := cfg.Prefix, cfg.Suffix
+
+	type row struct{ name, runtime, enabled, installed, path string }
+
+	rows := make([]row, 0, len(units))
+	for _, u := range units {
+		enabled := "yes"
+		if !u.Enabled {
+			enabled = "no"
+		}
+
+		installed := "no"
+		unitPath := "—"
+		if p, err := systemd.UnitPath(u, prefix, suffix); err == nil {
+			unitPath = p
+			if systemd.IsInstalled(u, prefix, suffix) {
+				installed = "yes"
+			}
+		}
+
+		rows = append(rows, row{u.Name, u.Runtime, enabled, installed, unitPath})
+	}
+
+	cols := []string{"NAME", "RUNTIME", "ENABLED", "INSTALLED", "SERVICE FILE"}
+	widths := make([]int, len(cols))
+	for i, c := range cols {
+		widths[i] = len(c)
+	}
+	for _, r := range rows {
+		vals := []string{r.name, r.runtime, r.enabled, r.installed, r.path}
+		for i, v := range vals {
+			if len(v) > widths[i] {
+				widths[i] = len(v)
+			}
+		}
+	}
+
+	fmt.Println()
+	printRow(cols, widths)
+	fmt.Println(strings.Repeat("─", totalWidth(widths)))
+	for _, r := range rows {
+		printRow([]string{r.name, r.runtime, r.enabled, r.installed, r.path}, widths)
+	}
+	fmt.Println()
+
+	return nil
+}